When Agent Pearce learns the identity of her fiancé's killer, she enlists Michael's help to seek revenge. Things get complicated when they discover the man is under protection as a CIA asset.
In Gate Station, a violent riot erupts between citizens and the police; Ashe and Preston confront Gov. Eamons regarding their latest suspicions surrounding Joey's murder; Ashe takes matters into her own hands when it comes to Javier.
Leslie travels to London to accept an award; Tom hunts down a businessman.
The group deals with the fallout from the events that took place at the Centennial celebration; Roxy and Trevor are able to take Drew home; Denise and Roland suspect that David's friend is being abused; Gloria confides in Jackie.
A run-in with rebels in Zambia leaves Jackson injured, but the hospital turns out to be overrun by animals; Jamie and Mitch try to formulate a cure; a surprising turn of events puts everything in jeopardy.